I have swapped out MT couplers (#2004) on an N scale Kato Dash-9 and now the couplers are too high. I am wondering what others have done for this conversion. If I use shims, I'm not sure the assembly will fit through the opening in the pilot. Do I need to file the opening lower to make room for shims? If any of you has done this conversion in the past, I would like to hear what you did to make them the correct height.

After, reviewing, the coupler,exploded view diagrams, in the link, I posted above, It appears, that Gary, may be correct. It shows the #2004, to be a underslung coupler, which would cause it to be higher, in the pocket, the 1015, is a regular shank coupler, so it will be lower in the pocket. Have a look see and you will see, what I mean.

After reading your posts, I took a look at the coupler closely. The 2004 is an underslung coupler where the shank connects to the coupler at the bottom, which essentially raises it. I took some standard 1015's, which lowered the coupler to where it needed to be. What is strange is that MT's website reccommends 2001 and 2004 (underslung), and even in the instructions, there was a paragraph or two about the Kato Dash-9. Oh well, the couplers on there now work just fine. The loco pulled a train last night for over an hour without a single uncoupling.

This might be a little late, but KATO changed the coupler pockets on later version of the Dash 9 C44-9w - If it has dich lights above the deck, in my case the pocket is higher set in the model and 2004 couplers will be too high. On the older models without the deck dich ligts the pocket is monted lower. it can vissable be seen when both a new and old run Dash 9 C44-9w are place next to each other. MTL/Micro Trains has bad information or needs to update it listings for KATO. Same issue with the SD70. it says it takes the 2004 but it realy takes the 2003. lazy on MTL part to not keep it's product listings up to date. This is now 2019 and the listings are still wrong on MTL product line up.